package org.example.filter;

import cn.lingyangwl.framework.core.response.Resp;
import cn.lingyangwl.framework.core.utils.servlet.ServletUtils;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.example.pojo.SecurityUser;
import org.example.pojo.User;
import org.example.security.TokenManager;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;
import org.springframework.security.web.util.matcher.AntPathRequestMatcher;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

/**
 * Description: 认证过滤器
 *
 * @author shenguangyang
 */
public class TokenLoginFilter extends UsernamePasswordAuthenticationFilter {
    private final TokenManager tokenManager;
    private final RedisTemplate<Object, Object> redisTemplate;
    private final AuthenticationManager authenticationManager;

    public TokenLoginFilter(AuthenticationManager authenticationManager, TokenManager tokenManager, RedisTemplate<Object, Object> redisTemplate) {
        this.authenticationManager = authenticationManager;
        this.tokenManager = tokenManager;
        this.redisTemplate = redisTemplate;
        this.setPostOnly(false);
        // 设置登录路径且为post提交
        this.setRequiresAuthenticationRequestMatcher(new AntPathRequestMatcher("/user/login","POST"));
    }

    //1 获取表单提交用户名和密码
    @Override
    public Authentication attemptAuthentication(HttpServletRequest request, HttpServletResponse response)
            throws AuthenticationException {
        //获取json提交数据
        try {
            User user = new ObjectMapper().readValue(request.getInputStream(), User.class);
            return authenticationManager.authenticate(new UsernamePasswordAuthenticationToken(user.getUsername(),user.getPassword(),
                    new ArrayList<>()));
        } catch (IOException e) {
            e.printStackTrace();
            throw new RuntimeException();
        }
    }

    //2 认证成功调用的方法
    @Override
    protected void successfulAuthentication(HttpServletRequest request,
                                            HttpServletResponse response, FilterChain chain, Authentication authResult)
            throws IOException, ServletException {
        // 认证成功，得到认证成功之后用户信息
        SecurityUser user = (SecurityUser)authResult.getPrincipal();
        //根据用户id+用户名生成token
        User currentUserInfo = user.getCurrentUserInfo();
        Map<String,Object> params = new HashMap<>();
        params.put("username",currentUserInfo.getUsername());
        params.put("id",String.valueOf(currentUserInfo.getId()));
        String token = tokenManager.createToken(params);
        //把用户名称和用户权限列表放到redis
        redisTemplate.opsForValue().set(user.getCurrentUserInfo().getUsername(),user.getPermissionValueList());
        //返回token
        ServletUtils.writeJson(Resp.ok(token, "成功"));
    }

    //3 认证失败调用的方法
    protected void unsuccessfulAuthentication(HttpServletRequest request, HttpServletResponse response, AuthenticationException failed)
            throws IOException, ServletException {
        ServletUtils.writeJson(Resp.fail("认证失败"));
    }
}
